Best silent/quiet PSU under £65

Solution
Here you go and made by the best = SEASONIC.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX 650W 80+ Bronze Certified Semi-Modular ATX Power Supply (£62.98 @ Amazon UK)
Total: £62.98
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-06 20:09 BST+0100)

Hybrid Fan Control Hybrid mode when activated, allows your fan to stay off when your computer is idle but turns on automatically when the PSU needs it. The fan operates silently under light load and switches to Quiet Mode (16dBA) when it reaches 20% load or 25°C, and switch to Cooling Mode when it reaches 50% load.

Dark Lord of Tech

Retired Moderator
Here you go and made by the best = SEASONIC.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX 650W 80+ Bronze Certified Semi-Modular ATX Power Supply (£62.98 @ Amazon UK)
Total: £62.98
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-06 20:09 BST+0100)

Hybrid Fan Control Hybrid mode when activated, allows your fan to stay off when your computer is idle but turns on automatically when the PSU needs it. The fan operates silently under light load and switches to Quiet Mode (16dBA) when it reaches 20% load or 25°C, and switch to Cooling Mode when it reaches 50% load.
 
Solution

+1, 620W PSU is great since it will give you room for upgrade space.